Fractal Design Silent Series R2 140mm Cooling Fan FD-FAN-SSR2-140 Specifically developed to deliver significant airflow while maintaining low noise levels. Included adapter to lower fan speed if desired. Equipped with high performance hydraulic bearings, increasing both fanperformance and reliability The cable on each Silent Series R2 fan is fully sleeved for effortless cable routing and enhanced aesthetics. Packaged with both 4 metal screws and 4 rubber screws to ensure maximum fan-mounting options. Using the rubber screws allows mechanical decoupling from the case itself, reducing vibrations and decreasing the noise level.